TP, as long as you have your receipt, noting the serial no. of the cartridge, there should not be a problem. I'm not sure why JA wants you to send it directly to him. If it's currently covered by a warranty, then I believe the dealer from whom you purchased it is the responsible party.
JA might have a perfectly good reason for his request, but first, for your own protection, you should have it in writing from JA and the dealer that there is a warranty currently in effect.
.
JA might have a perfectly good reason for his request, but first, for your own protection, you should have it in writing from JA and the dealer that there is a warranty currently in effect.
.